Improvement in steam-generators



R. H. THOM.

Steam-Generator.

Patented Sept. 14,1875.

Honooamooeo an nH 0 NJETERS, PHOTOLITHOGRAPHER, WASHINGTON. O C.

UNITED STATES PATENT OFFICE.

ROYAL H. THOM, OF SYRACUSE, NEW YORK.

IMPROVEMENT IN STEAM-G ENE RATORS.

Specification forming part of Letters Patent No. 167,711, datedSeptember 14, 1875; application filed February 6, 1875.

To all whom it may concern:

Be it known that I, ROYAL H. THOM, of Syracuse, Onondaga county, NewYork, have invented certain Improvements in Steam-Generators, of whichthe following-is a specification:

My improvements in steam-generators are intended to cheapen theirmanufacture and render the tubes and other joints more durable, avoidingthereby all undue strains upon them from expansion and contraction,while from the ,formation and combination of the parts a rapid andefficient generation of steam is insured.

The construction is as follows, referring to the accompanying drawing,in which- Figure 1 is an exterior elevation. Fig. 2 is a verticalsection through the center of the generator. Fig. 3 is a horizontalsection on the line'A, Fig. 2.

The shell on of the generator, as shown in the drawing, is cylindrical,although that particular figure is not necessary, but I deem it thebest. It is made of sheet metal, with water'legs a surrounding thefire-chamber, and a fire-door, b, of ordinary form. Into the crownsheetof the fire-chamber I firmly afiix a series of tubes, 0, that open intothe fire-chamber, as smoke fines. The upper ends of these tubes 0 arescrewed or otherwise fastened into the bottom plate of a flat chamber,d, which I prefer to make of cast metal, as clearly shown in thesectional figures. To the upper plate of the chamber d a smoke-pipe, c,is affixed that opens into it, as seen in Fig. 2. This smoke-pipe runsup through the upper head of the shell a through a stuffing-box, a".

By this arrangement and construction of parts the chamber d is allowedto yield freely to the expansions and contractions of the tubes 0 beforenamed, the pipe 6 sliding through the stuffing-box a for that purpose. Iconnect the side shell a with the head by means of angle-iron f rivetedto the shell to which the head is bolted, as shown in Fig. 2. To insurethe perfect combustion of the fuel I introduce an air-pipe, h,thatextends up through the bottom of water-leg a parallel with tubes c,and opens into the chamber d, supplying air at that point to consume theunburned fuel escaping into said chamber.

The water-injection pipe 1', after entering the boiler, is turnedupward, extending some distance above the entering-orifice, so as toheat upthe water somewhat before entering the generator from said pipe,which I deem important in point of economy in the use of said generator.

Having thus fully described my improved steam-generator, I claim l. Thecombination of the tubes 0, movable chamber and sliding smoke-pipe c,passing through a stuffing-box in the top of the boiler, constructed andarranged substantially as an for the purposes set forth.

2. The combination of the straight air-tube h with the movableadjustable chamber d, as described, and passing down through thewater-leg within the boiler, so as to accommodate it to the expansionand contraction of the tubes 0, as specified.

I ROYAL H. THOM.

Witnesses:

J. J. GREENOUGH,

PE ER B. MOLENNAN.

